123040203403040 has 192 divisors, whose sum is σ = 362429312474880. Its totient is φ = 38348078346240.

The previous prime is 123040203403027. The next prime is 123040203403067. The reversal of 123040203403040 is 40304302040321.

It is a super-2 number, since 2×123040203403040² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231017366 + ... + 231549354.

It is an arithmetic number, because the mean of its divisors is an integer number (1887652669140).

Almost surely, 2^{123040203403040} is an apocalyptic number.

123040203403040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123040203403040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181214656237440).

123040203403040 is an abundant number, since it is smaller than the sum of its proper divisors (239389109071840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123040203403040 is a wasteful number, since it uses less digits than its factorization.

123040203403040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550795 (or 550787 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 123040203403040 its reverse (40304302040321), we get a palindrome (163344505443361).

The spelling of 123040203403040 in words is "one hundred twenty-three trillion, forty billion, two hundred three million, four hundred three thousand, forty".